Feature request: Please add copy to clipboard

If I used another application such as MarkText

if I put my code within these lines ```

For example:


As you can see over here, I am able to press on that icon to copy the entire code as plain text, I wish tha joplin would have that same feature.

I save a lot of code/commands on joplin and it would be nice that such a button would exist so I can copy and paste it.